Here's a breakdown:
* Respiratory System: They have a well-developed respiratory system with lungs, trachea, and bronchi.
* Inhalation: Air is drawn into the lungs through their nostrils.
* Exhalation: Carbon dioxide is expelled from the lungs through their nostrils.
Interesting fact: Echidnas have a unique adaptation for breathing while foraging. When they are digging for ants and termites with their long snout, they can close their nostrils to prevent dirt from entering. They rely on a small opening at the tip of their snout called the rostral organ for breathing while they forage.